KEEP OR PUT HEAT IN THE MOTOR! This cannot be expressed enough! Wrap the motor with foil. Block air from prop from getting to motor. Preheat motor with heat gun(it is your friend) to at least 200 F., 230 or 240 is better. With rich breakin settings you will have to hold the heat gun on head to maintain the temp. Use a temp gun. Just don't let it get too cool when its running. The motor gets to much abuse when its in the car and there is no sence in abusing it on the bench, just keep that thing hot and rich on the bench. When you put it in the car you might still need foil on head to maintain temp, just don't run it cold(below 200 F.) Maintaining temp in the car will be easier because you will start to lean it and that helps build temp.

I break the motor at an idle for one tank @ 180-200 Deg. piston BDC and let cool for 10 min. Then I do two straight tanks at an idle 190-200 Deg, and let cool for 15 min, piston BDC. Then two more straight tanks @ 200-220 Deg, and let cool for 15 min then on the track for a tank around at 200-220 for a tank and then let her rip. Also when breaking in the engine I do clear it out a couple times a tank at 4 stroke level, just to clear it. I also made a sleeve that wraps around the head during break in for even temp, it is made from race car exhaust insulating wrap, it made to wrap headers, and it works awesome and very temperature control around the engine body nicely.

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